i have own my 08 535XI since July and start driving in Aug. honestly, i have to admit it put smiles on my face every time i drive it but i'm still disappointed how fragile for some interior component like heated seat fail, sunroof seal leak etc etc.
i can see mechanic will cause more problematic as the engine is under BOOST. i won't say i have regret what i got as it does create what Bimmer advertise "Ultimate driving machine"